This is one of the If statements that helps populate the dialog type form.:
If Forms!FTAC_frm!Plant_cbx.Value = "Portland, OR" Then
Forms!Overseas_frm!ExpOrigin_tbx.Value = "Clackamas, OR"
Here FTAC_frm is the main form. Also,
DoCmd.OpenForm "Overseas_frm", acNormal, , , , acDialog
is...